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  <title>Document</title>
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  <script>
    arr=[1,2,3,4,5,6,7]
    function handleData(array,flag) {
      let sum=0
      let flag=1  
      if(flag===true||flag===1) {
      
        for(let i=0;i<array.length;i++) {
          sum+=array[i]
        }
        return sum
      }
      if(flag===false){
        for(let i=0;i<array.length;i++) {
          sum+=array[i]
        }
      }
      return sum/array.length
    }

    handleData(arr, false)  
    console.log( handleData(arr, false) ); 

  </script>
</body>
</html>